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If you drill and tap some 3" square plates and weld them to the bottom of the floor, you can remove the seat easily with four bolts. I would put the seat in the center of the van for convenience and a smoother ride for anyone sitting in it.

If you drill and tap some 3" square plates and weld them to the bottom of the floor, you can remove the seat easily with four bolts. I would put the seat in the center of the van for convenience and a smoother ride for anyone sitting in it.

if your doing that, just weld the nuts to the plate while your at it. removing seat would be a 5 minute job and only need 4 small holes in the carpet.

Given the baby needs to secure, and safe, as well as easily accessible, while keeping Mom happy, I would mount two pedestal seats one behind each front seat - - - one for Mom, the other for the baby - - - to make the seats easily removable, run the bolts "up" through the floor, so the seats & pedestals can be quickly removed,

I like the idea of welding a nut to the original mounting plate. Then have a bolt long enough to reach all the way down there.

Vanner68, what does drill and tap 3" square plate means? I imagine it's something like the illustration?

Thanks everyone for the suggestions so far!

Similar, the plate would be welded under the stock location, if you make the plate the width of the floor rib it can slide under the stock location. The purpose of a plate is to spread the load, a nut could pull through that keyhole slot in an accident. I had no stock mounting holes so I drilled though the floor and put the plates underneath.